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The scaling down of thermionic emitters to the microscale is achieved by using microfabrication technologies and graphene working as the emitter. A graphene micro-emitters can be turned on by a voltage of several volts and its emission current exhibits a tunability of up to six orders by a modest gate. Importantly, emission performances of graphene micro-emitters are controllable and repeatable through...
We have considered the opportunities and challenges of fabricating a planar vacuum transistor using the edge of a single layer graphene sheet as a field emission electron source. The emission current needed to produce significant gain and power at mm-wave frequencies is roughly 100mA/mm. Simple arguments suggest such emission currents are possible.
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